Linking to ftp user home directory with proftp

I use proftpd, i don't use ispconfig, i have only few users. system is debian 4.0, proftpd is 1.2.10. i think proftpd is not chrooted.

i'm looking for idea about good way to link other directories from file system (e.g. /var/www/pythonframework to users directory) to user who logs in via ftp.

I tried to use "mount --bind" command (e.g. mount --bind /var/www/pythonframework /home/user/pythonframework) and then i changed permission for directory but when i log in using ftp client (filezilla) i'm not able to access pythonframework directory (filezilla gives error).
Otherwise i can navigate from command line to that directory and e.g. change name of the file.

I'm looking for something flexible so i can link or dis-link some directories often or when necessary.